CN112629167A - Borax drying method and equipment - Google Patents
Borax drying method and equipment Download PDFInfo
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- CN112629167A CN112629167A CN202011400405.6A CN202011400405A CN112629167A CN 112629167 A CN112629167 A CN 112629167A CN 202011400405 A CN202011400405 A CN 202011400405A CN 112629167 A CN112629167 A CN 112629167A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B1/00—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids
- F26B1/005—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids by means of disintegrating, e.g. crushing, shredding, milling the materials to be dried
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
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Abstract
The borax drying method and the device thereof comprise the following steps: (1) the method comprises the following steps of (1) pre-treating, (2) pre-treating, namely putting a tray on a pipeline of drying equipment, introducing water vapor into the pipeline of the drying equipment for heating, and vacuumizing heated borax in the drying equipment to remove moisture; (3) turning and crushing; (4) removing water, namely putting the turned and crushed borax into drying equipment, introducing water vapor into a pipeline to heat the borax, and vacuumizing the heated borax again; (5) and (5) post-treatment. According to the invention, through pretreatment and dehydration treatment, the moisture of the borax is well controlled in the range of polar regions, the borax is heated by introducing steam into a pipeline, the heating cost is saved, the moisture in the drying equipment is pumped out through vacuumizing, the water content of the borax is extremely low, the slow temperature rise in the drying equipment is controlled, the damage to the internal structure of the borax is avoided, and the medicine property of the borax is ensured not to be damaged.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of borax drying, in particular to a borax drying method and a borax drying device.
[ background of the invention ]
Medicine need carry out dry dewatering treatment to it before processing production, especially dry plant type chinese medicinal material, need its moisture content of strict control below certain numerical value, can guarantee that its property of a medicine is normal, the stoving of moisture content is carried out to the medicinal material to adopting the heated air circulation oven to carry out now generally, through the effect of electrical heating and dehumidifier, carry out drying and dehumidification operation to the medicinal material, this kind of mode often consumes a large amount of power energy consumptions, and the moisture content of the medicinal material after handling is higher relatively, can not satisfy some specific medicinal materials, moreover, cause certain structural damage to the medicinal material easily in the current method preparation process, lead to the property of a medicine to reduce, its production cycle is longer simultaneously, so one kind can effectively go out the medicinal material moisture content, can not destroy the medicinal material structure, method and equipment that production efficiency is high and the energy consumption is low awaits developing urgently.
[ summary of the invention ]
The invention aims to solve the problems, provides a borax drying method and a device using the same, and solves the problems of high borax moisture, high device energy consumption, easy damage to a medicinal material structure and low production efficiency in the conventional borax preparation and device.
In order to achieve the purpose, the invention adopts the following technical scheme:
a borax drying method comprises the following steps:
(1) pre-treating, namely spreading borax in a tray;
(2) pre-treating, namely putting the tray on a pipeline of drying equipment, introducing water vapor into the pipeline of the drying equipment for heating, and vacuumizing the heated borax in the drying equipment to remove moisture;
(3) turning and crushing, namely taking the pretreated borax out, turning, and putting the turned borax into a crushing machine for crushing;
(4) removing water, namely putting the turned and crushed borax into drying equipment, introducing water vapor into a pipeline to heat the borax, and vacuumizing the heated borax again;
(5) and post-treatment, namely taking out the product subjected to water removal, and carrying out sealing and packaging treatment.
Preferably, the heating treatment in the step (2) is a gradual heating process, the pressure of the water vapor introduced into the pipeline is controlled to be 0.2MPa, the temperature in the drying equipment is increased to 90 ℃ within 40-60min, the pressure of the introduced water vapor is changed to be 0.05MPa, and the temperature is kept for 2 hours at 90 ℃.
Preferably, in the step (2), the heated borax is vacuumized to-0.086-0.075 MPa in a drying device.
Preferably, the material turning and crushing in the step (3) are carried out for 1.5 hours in an environment with the temperature of 25 ℃ and the humidity of not more than 5%.
Preferably, in the step (4), the drying equipment is required to be slowly heated to 90-100 ℃ in the water removal treatment, the time required for heating is 25-30min, and the pressure of water vapor is kept at 0.25 MPa.
Preferably, the water removal treatment in step (4) requires heat preservation at 90-100 ℃ for 6 hours, and the pressure of the water vapor is maintained at 0.05 MPa.
Preferably, the heated borax in the drying equipment is vacuumized to-0.086-0.075 MPa.
Preferably, in the step (5), the sealed and packaged borax is stored in a constant-temperature dry environment, the temperature of the environment is 25 ℃, and the humidity is not more than 5%.
A drying device comprises a machine body, a placing part, a water vapor pipeline and a vacuum pipeline;
the plurality of placing parts are arranged in the machine body, the water vapor pipeline penetrates through the machine body and is communicated with the plurality of placing parts, and the vacuum pipeline is arranged at the top of the machine body.
Preferably, the steam generator further comprises a pressure display, the pressure display is arranged at the top of the generator body and is communicated with the steam pipeline.
The contribution of the invention lies in: according to the invention, through pretreatment and dewatering treatment, the moisture of borax is well controlled in the range of polar regions, the borax is heated by introducing steam into a pipeline, the heating cost is saved, the heating efficiency is improved, the moisture in the drying equipment is pumped out through vacuumizing, the water content of the borax is extremely low, through material turning and crushing treatment, the contact area of the borax and the outside is further increased, the area of moisture loss is increased, the dewatering efficiency is improved, through controlling the slow temperature rise in the drying equipment, the damage to the internal structure of the borax is avoided, and the medicine property of the borax is ensured not to be damaged.
[ description of the drawings ]
FIG. 1 is a schematic structural view of a drying apparatus according to the present invention;
FIG. 2 is a flow chart of the preparation process of borax;
wherein: the device comprises a machine body 10, a placing part 20, a water vapor pipeline 30, a vacuum pipeline 40 and a pressure display 50.
[ detailed description ] embodiments
The following examples are further illustrative and supplementary to the present invention and do not limit the present invention in any way.
As shown in fig. 1-2, a borax drying method includes the following steps:
(1) pre-treating, namely spreading borax in a tray;
(2) pre-treating, namely putting the tray on a pipeline of drying equipment, introducing water vapor into the pipeline of the drying equipment for heating, and vacuumizing the heated borax in the drying equipment to remove moisture;
(3) turning and crushing, namely taking the pretreated borax out, turning, and putting the turned borax into a crushing machine for crushing;
(4) removing water, namely putting the turned and crushed borax into drying equipment, introducing water vapor into a pipeline to heat the borax, and vacuumizing the heated borax again;
(5) and post-treatment, namely taking out the product subjected to water removal, and carrying out sealing and packaging treatment.
The borax drying method mainly comprises the steps of pretreatment, stirring and crushed aggregate treatment, dewatering treatment and post-treatment, wherein the pretreatment comprises the steps of uniformly paving borax on a tray, the pretreatment comprises the step of placing the tray on a pipeline of drying equipment, introducing water vapor into the pipeline of the drying equipment for heating, vacuumizing the heated borax in the drying equipment to remove water, specifically, the pressure of the water vapor introduced into the pipeline is controlled to be 0.2MPa, the temperature in the drying equipment is raised to 90 ℃ within 40-60min, the pressure of the introduced water vapor is changed to be 0.05MPa, the temperature is kept for 2 hours at 90 ℃, then the introduction of the water vapor is stopped, the vacuumizing equipment is opened, the vacuumizing treatment is carried out inside the drying equipment, when the temperature is reduced to-0.086 MPa, nitrogen gas is introduced into the drying equipment to enable the pressure to be consistent with the outside, and opening the drying equipment to take out the borax inside, and well removing the moisture on the surface of the borax by pretreatment, so that the subsequent dewatering operation is facilitated.
The reverse side of the pretreated borax is turned and crushed aggregates are treated, the borax on the top can be ensured to leak violently, the moisture of the borax can be removed in the next water removal process, the crushed aggregates are treated to enable the borax to be thinner so that the borax can be fully contacted with the outside, the water dispersion area of the borax is increased, the moisture in the borax is easily dispersed, the subsequent water removal operation is convenient, the turning and crushed aggregates are finished in the environment with the humidity of lower than 5% at 25 ℃, and the borax is ensured not to absorb the excessive moisture in the outside.
And the water removal treatment is to put the turned and crushed borax into a drying device, introduce water vapor into a pipeline to heat the borax, and vacuumize the heated borax again, specifically, slowly raise the temperature of the drying device to 90-100 ℃, the time required for raising the temperature is 25-30min, the pressure of the water vapor is kept at 0.25MPa, the temperature is kept at 90-100 ℃ for 6 hours, the pressure of the water vapor is kept at 0.05MPa, the input of the water vapor is closed after 6 hours, nitrogen is introduced into the drying device, the pressure of the nitrogen is consistent with the outside, the vacuumizing device is opened, and the inside of the drying device is pumped to-0.086 MPa.
The post-treatment is to take out the dewatered product, and carry out sealing and packaging treatment, wherein the process is carried out in an environment with the temperature of 25 ℃ and the humidity of not more than 5%.
According to the invention, through pretreatment and dewatering treatment, the moisture of borax is well controlled in the range of polar regions, the borax is heated by introducing steam into a pipeline, the heating cost is saved, the heating efficiency is improved, the moisture in the drying equipment is pumped out through vacuumizing, the water content of the borax is extremely low, through material turning and crushing treatment, the contact area of the borax and the outside is further increased, the area of moisture loss is increased, the dewatering efficiency is improved, through controlling the slow temperature rise in the drying equipment, the damage to the internal structure of the borax is avoided, and the medicine property of the borax is ensured not to be damaged.
Further, the heating treatment in the step (2) is a gradual temperature rise heating process, the pressure of the water vapor introduced into the pipeline is controlled to be 0.2MPa, the temperature in the drying equipment is raised to 90 ℃ within 40-60min, the pressure of the introduced water vapor is changed to be 0.05MPa, and the temperature is kept at 90 ℃ for 2 hours.
Through control progressively intensifies, the structure of having ensured borax can not destroyed, the existence of having ensured its property of a medicine can not receive the influence, and in the heating intensification process, use the steam intensification, the saving cost that can be fine, it is also safer to compare in electric heating, when the temperature reaches the uniform temperature, can reduce the flux of steam, make the temperature in the drying equipment still keep at certain numerical value, the consumption of further reduction energy, the fine preliminary moisture content of having detached the borax surface of preliminary treatment.
Further, in the step (2), the heated borax is vacuumized to-0.086 MPa in a drying device.
Vacuumizing the heated borax to-0.086-0.075 MPa in a drying device, and ensuring that the moisture in the device can be completely pumped out of the device, so that the borax can keep a dry state.
More specifically, the material turning and crushing in the step (3) are carried out for 1.5 hours in an environment with the temperature of 25 ℃ and the humidity of not more than 5%.
Avoid borax to absorb water, wasted the effect of preliminary treatment, the crushed aggregates is in order to make the area of contact grow of borax for its inside moisture content distributes out more easily, and the stirring is in order to make the different face of borax all can be heated evenly, and avoids some borax because pile up, has retarded the giving off of moisture content.
Further, in the step (4), the drying device is required to be slowly heated to 90-100 ℃ for 25-30min during the water removal treatment, and the pressure of the water vapor is kept at 0.25 MPa.
Further, the water removal treatment in step (4) requires heat preservation at 90-100 ℃ for 6 hours, and the pressure of the water vapor is maintained at 0.05 MPa.
Further, the heated borax in the drying equipment is vacuumized to-0.086-0.075 MPa.
Control progressively warms up to 90-100 degrees centigrade, avoid rapid heating up and lead to the inside structure of medicinal material to be destroyed, can ensure through slowly rising up the temperature that the inner structure of borax can not be destroyed, it can not receive the influence to have ensured the existence of its property of a medicine, and in the heating intensification process, use steam intensification, the saving cost that can be fine, also safer compared with electric heating, when the temperature reaches the uniform temperature, can reduce the flux of steam, make the temperature in the drying equipment still keep at certain numerical value, further reduce the consumption of the energy, fine moisture content of having detached borax, ensure that it can keep in a state that the water content is lower, it is good to have ensured the property of a medicine of borax. The vacuum pumping is carried out to-0.086-0.075 MPa, so that the water vapor in the equipment can be well pumped out, and the water content of the borax is ensured to be very low.
In a further way, in the step (5), the sealed and packaged borax is stored in a constant-temperature and dry environment, wherein the temperature of the environment is 25 ℃, and the humidity is not more than 5%.
Carry out seal packing with it in dry environment, avoid inside moisture content gets into borax, lead to the water content to improve, influenced the property of a medicine, influence the use.
A drying apparatus includes a body 10, a placing part 20, a water vapor duct 30 and a vacuum duct 40;
the plurality of the placing parts 20 are provided in the machine body 10, the steam pipe 30 penetrates the machine body 10, the steam pipe 30 communicates with the plurality of the placing parts 20, and the vacuum pipe 40 is provided on the top of the machine body 10.
Drying equipment mainly includes organism 10, placing part 20, steam conduit 30 and vacuum pipeline 40, wherein, placing part 20 is used for placing the tray, borax has been put in the tray, and placing part 20 and steam conduit 30 intercommunication, through the steam to letting in certain pressure in the steam conduit 30, thereby can give placing part 20 heating, finally carry out heat treatment with the borax in the tray, vacuum pipeline 40 locates the top of organism 10, vacuum pipeline 40 is used for extracting the gas in the drying equipment, with the moisture extraction equipment in the equipment, ensure that borax can keep dry.
In a further description, a pressure display 50 is further included, the pressure display 50 is disposed on the top of the machine body 10, and the pressure display 50 is communicated with the water vapor pipeline 30.
The invention is further illustrated by the following examples.
The borax drying method and the equipment using the same in embodiments 1 to 6 both include the following steps:
(1) pre-treating, namely spreading borax in a tray;
(2) pre-treating, namely putting the tray on a pipeline of drying equipment, introducing water vapor into the pipeline of the drying equipment for heating, and vacuumizing the heated borax in the drying equipment to remove moisture;
(3) turning and crushing, namely taking the pretreated borax out, turning, and putting the turned borax into a crushing machine for crushing;
(4) removing water, namely putting the turned and crushed borax into drying equipment, introducing water vapor into a pipeline to heat the borax, and vacuumizing the heated borax again;
(5) and post-treatment, namely taking out the product subjected to water removal, and carrying out sealing and packaging treatment.
Examples 1-6 the final evacuation pressure was varied for step (4) and the moisture content was measured by the rapid method (rapid method is a method of sampling borax using a rapid moisture meter to measure its moisture content) and the baking method, respectively.
The drying method comprises the steps of taking 2-5 g of a test article, flatly paving the test article in a flat weighing bottle which is dried to constant weight, precisely weighing the test article until the thickness is not more than 5mm and the loose test article is not more than 10mm, opening a bottle cover, drying for 5 hours at 100-105 ℃, covering the bottle cover, moving the bottle cover into a dryer, cooling for 30 minutes, precisely weighing, drying for 1 hour at the temperature, cooling, weighing, and weighing until the difference of continuous weighing for two times is not more than 5 mg. The water content (%) in the test article was calculated from the weight loss.
The results are shown in the following table.
As can be seen from the above table, examples 1-6 all had low moisture contents, wherein the moisture content measured by the rapid method was between 2.1% and 2.92%, the moisture content measured by the drying method was between 3.21% and 4.41%, and example 6 had the lowest moisture content, and it can be seen from the table that the lower the vacuum pressure, the lower the moisture content of the finally obtained borax, indicating that most of the moisture was evacuated to the outside of the apparatus by evacuation.
The steps of examples 7 to 12 were all the same as those of example 6 except that the rise time and the finally maintained drying temperature in step (4) were changed, and the results are shown in the following table.
As can be seen from examples 7-12, examples 7-12 all had lower moisture content, the moisture content of which was inversely proportional to the temperature rise time, the longer the temperature rise time, the lower the moisture content of borax, the inversely proportional to the drying temperature, the higher the drying temperature, the lower the moisture content of borax, the inversely proportional to the drying time, and the longer the drying time, the lower the moisture content of borax.
The steps of examples a to f were identical to those of example 6 except that the temperature rise time and the evacuation pressure in step (2) were changed, and the water content of borax after step (2) was measured by the flash method and the baking method, respectively, and the results are shown in the following table.
As can be seen from examples a to f, as the time for slow heating in the pretreatment and the pressure for vacuum pumping are increased, the lower the moisture content of the borax is, and the errors measured by the rapid method and the baking method are not large, the pretreatment can remove a part of the moisture in the borax (the untreated borax is decahydrate, Na2B4O7·10H2O, the moisture content is about 47 percent), but the moisture content with the distance less than 7 percent still has certain difference, and further dehydration treatment is needed because borax is not crushed and crystal water in the borax is not easy to volatilize.
Although the present invention has been described in connection with the above embodiments, the scope of the present invention is not limited thereto, and modifications, substitutions, etc. made to the above components are intended to fall within the scope of the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. The borax drying method is characterized by comprising the following steps:
(1) pre-treating, namely spreading borax in a tray;
(2) pre-treating, namely putting the tray on a pipeline of drying equipment, introducing water vapor into the pipeline of the drying equipment for heating, and vacuumizing the heated borax in the drying equipment to remove moisture;
(3) turning and crushing, namely taking the pretreated borax out, turning, and putting the turned borax into a crushing machine for crushing;
(4) removing water, namely putting the turned and crushed borax into drying equipment, introducing water vapor into a pipeline to heat the borax, and vacuumizing the heated borax again;
(5) and post-treatment, namely taking out the product subjected to water removal, and carrying out sealing and packaging treatment.
2. The borax drying method according to claim 1, wherein: the heating treatment in the step (2) is a gradual temperature rise heating process, the pressure of the water vapor introduced into the pipeline is controlled to be 0.2MPa, the temperature in the drying equipment is raised to 90 ℃ within 40-60min, the pressure of the introduced water vapor is changed to be 0.05MPa, and the temperature is kept for 2 hours at 90 ℃.
3. The borax drying method according to claim 1, wherein: and (2) vacuumizing the heated borax in a drying device to-0.086-0.075 MPa.
4. The borax drying method according to claim 1, wherein: and (4) turning and crushing the materials in the step (3), and keeping the materials for 1.5 hours in an environment with the temperature of 25 ℃ and the humidity of not more than 5%.
5. The borax drying method according to claim 1, wherein: in the step (4), the dewatering treatment needs to slowly heat the drying equipment to 90-100 ℃, the time required by heating is 25-30min, and the pressure of water vapor is kept at 0.25 MPa.
6. The borax drying method according to claim 5, wherein: the water removal treatment in the step (4) needs to be carried out at 90-100 ℃ for 6 hours, and the pressure of the water vapor is kept at 0.05 MPa.
7. The borax drying method according to claim 5, wherein: vacuumizing the heated borax in the drying equipment to-0.086-0.075 MPa.
8. The borax drying method according to claim 1, wherein: in the step (5), the sealed and packaged borax is placed in a constant-temperature dry environment for storage, wherein the temperature of the environment is 25 ℃, and the humidity is not more than 5%.
9. The utility model provides a drying equipment which characterized in that: comprises a machine body, a placing part, a water vapor pipeline and a vacuum pipeline;
the plurality of placing parts are arranged in the machine body, the water vapor pipeline penetrates through the machine body and is communicated with the plurality of placing parts, and the vacuum pipeline is arranged at the top of the machine body.
10. The utility model provides a drying equipment which characterized in that: still include the pressure display, the pressure display is located the top of organism, just the pressure display with the steam conduit intercommunication.
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| CN202011400405.6A CN112629167A (en) | 2020-12-03 | 2020-12-03 | Borax drying method and equipment |
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| CN202011400405.6A CN112629167A (en) | 2020-12-03 | 2020-12-03 | Borax drying method and equipment |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2122357U (en) * | 1991-11-07 | 1992-11-18 | 沈善明 | Plate type steam heating vacuum crying cabinet |
| CN1453112A (en) * | 2002-04-23 | 2003-11-05 | 尹兴伊 | Crushing and drying method and apparatus for high-moisture diatomite |
| CN200986366Y (en) * | 2006-12-20 | 2007-12-05 | 张宗保 | Anti-condensation vacuum drying oven capable of achieving rapid medicine wet-heat sterilization |
| CN106482461A (en) * | 2016-12-12 | 2017-03-08 | 南京淮腾机械科技有限公司 | A kind of cryogenic vacuum steam drying cabinet |
| CN106728949A (en) * | 2017-03-07 | 2017-05-31 | 云南锦斛国草农业发展有限公司 | A kind of processing method of dendrobium candidum |
| CN110926120A (en) * | 2018-12-28 | 2020-03-27 | 韩荣献 | Dynamic vacuum system with balanced chamber and material drying method |
| CN112089797A (en) * | 2020-08-20 | 2020-12-18 | 天马（安徽）国药科技股份有限公司 | Preparation method of superfine gastrodia elata powder and vacuum freeze-drying preparation of superfine gastrodia elata powder |
-
2020
- 2020-12-03 CN CN202011400405.6A patent/CN112629167A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2122357U (en) * | 1991-11-07 | 1992-11-18 | 沈善明 | Plate type steam heating vacuum crying cabinet |
| CN1453112A (en) * | 2002-04-23 | 2003-11-05 | 尹兴伊 | Crushing and drying method and apparatus for high-moisture diatomite |
| CN200986366Y (en) * | 2006-12-20 | 2007-12-05 | 张宗保 | Anti-condensation vacuum drying oven capable of achieving rapid medicine wet-heat sterilization |
| CN106482461A (en) * | 2016-12-12 | 2017-03-08 | 南京淮腾机械科技有限公司 | A kind of cryogenic vacuum steam drying cabinet |
| CN106728949A (en) * | 2017-03-07 | 2017-05-31 | 云南锦斛国草农业发展有限公司 | A kind of processing method of dendrobium candidum |
| CN110926120A (en) * | 2018-12-28 | 2020-03-27 | 韩荣献 | Dynamic vacuum system with balanced chamber and material drying method |
| CN112089797A (en) * | 2020-08-20 | 2020-12-18 | 天马（安徽）国药科技股份有限公司 | Preparation method of superfine gastrodia elata powder and vacuum freeze-drying preparation of superfine gastrodia elata powder |
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Application publication date: 20210409 |